Equivalent & Substitute Parts for BK/MDA-30A-R Ceramic Cartridge Fuse

Part Overview

The BK/MDA-30A-R is a 30 A ceramic cartridge fuse rated for 250 V AC and 125 V DC operation, manufactured by Eaton Electronics Division. This component is classified as obsolete, requiring identification of active equivalent alternatives for continued system support and procurement.

Ceramic cartridge fuses in the 3AB/3AG form factor are critical protective devices in industrial and commercial electrical systems. The obsolete status of the BK/MDA-30A-R necessitates substitution with functionally equivalent active-status components that maintain identical electrical and mechanical specifications.

Key Parameters

Parameter	Value
Current Rating	30 A
Voltage Rating AC	250 V
Voltage Rating DC	125 V
Fuse Type	Cartridge, Ceramic
Response Time	Slow Blow
Package / Case	3AB, 3AG, 1/4" x 1-1/4" (6.35mm x 31.75mm)
Mounting Type	Requires Holder
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution eligibility for the BK/MDA-30A-R is determined by strict equivalence across the following parameters:

Primary Equivalence Criteria:

Current Rating: 30 A (exact match required)
Voltage Rating AC: 250 V (exact match required)
Voltage Rating DC: 125 V (exact match required)
Fuse Type: Cartridge, Ceramic (exact match required)
Response Time: Slow Blow (exact match required)
Package / Case: 3AB, 3AG, 1/4" x 1-1/4" (exact match required)
Mounting Type: Requires Holder (exact match required)

Substitute Categories:

Category 1: Eaton Electronics Division Direct Equivalents (Active Status)

BK/MDA-30-R
BK/MDA-B-30-R
MDA-30-R

These parts maintain identical electrical specifications, mechanical dimensions, and response characteristics as the obsolete BK/MDA-30A-R. All three are active-status components with current inventory availability.

Category 2: Littelfuse Inc. Parametric Equivalents (Active Status)

0326030.HXP
0326030.MXP
0326030.VXP

These Littelfuse components satisfy all primary equivalence criteria. They are manufactured to the same 3AB/3AG form factor with identical current, voltage, and response specifications. All three are active-status components with current inventory availability.

Parameter Comparison

Parameter	BK/MDA-30A-R (Main)	BK/MDA-30-R	BK/MDA-B-30-R	MDA-30-R	0326030.HXP	0326030.MXP	0326030.VXP
Manufacturer	Eaton	Eaton	Eaton	Eaton	Littelfuse	Littelfuse	Littelfuse
Current Rating (A)	30	30	30	30	30	30	30
Voltage AC (V)	250	250	250	250	250	250	250
Voltage DC (V)	125	125	125	125	125	125	125
Fuse Type	Cartridge, Ceramic	Cartridge, Ceramic	Cartridge, Ceramic	Cartridge, Ceramic	Cartridge, Ceramic	Cartridge, Ceramic	Cartridge, Ceramic
Response Time	Slow Blow	Slow Blow	Slow Blow	Slow Blow	Slow Blow	Slow Blow	Slow Blow
Package / Case	3AB, 3AG, 1/4" x 1-1/4"	3AB, 3AG, 1/4" x 1-1/4"	3AB, 3AG, 1/4" x 1-1/4"	3AB, 3AG, 1/4" x 1-1/4"	3AB, 3AG, 1/4" x 1-1/4"	3AB, 3AG, 1/4" x 1-1/4"	3AB, 3AG, 1/4" x 1-1/4"
Size (mm)	6.35 x 31.75	6.35 x 31.75	6.35 x 31.75	6.35 x 31.75	6.35 x 31.75	6.35 x 31.75	6.35 x 31.75
Mounting Type	Requires Holder	Requires Holder	Requires Holder	Requires Holder	Requires Holder	Requires Holder	Requires Holder
Product Status	Obsolete	Active	Active	Active	Active	Active	Active
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	Not Specified	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

Primary Recommendation: Eaton Electronics Division Active Equivalents

For applications requiring direct manufacturer continuity and established supply chain relationships, select from the active-status Eaton equivalents:

BK/MDA-30-R: Recommended as primary substitute. Active product status with 2,475 units in stock. Maintains identical electrical specifications and mechanical form factor. Certifications: CE, CSA, UL.
MDA-30-R: Alternative Eaton equivalent with active status and 772 units in stock. Identical specifications to BK/MDA-30-R. Certifications: CE, CSA, UL.
BK/MDA-B-30-R: Active-status Eaton equivalent with 900 units in stock. Certifications: CSA, UR.

Secondary Recommendation: Littelfuse Inc. Parametric Equivalents

For applications where cross-manufacturer substitution is acceptable, Littelfuse components provide equivalent electrical and mechanical performance:

0326030.MXP: Highest inventory availability (2,347 units). Active status. Certifications: CE, CSA, K-MARK, PSE, UL. Operating temperature range: -55°C to 125°C.
0326030.HXP: Active status with 742 units in stock. Certifications: CE, CSA, K-MARK, PSE, UL. Operating temperature range: -55°C to 125°C.
0326030.VXP: Active status with 912 units in stock. Certifications: CE, CSA, PSE, UL. Operating temperature range: -55°C to 125°C.

Compliance Considerations:

All substitute parts are ROHS3 compliant and carry appropriate regulatory certifications (CE, CSA, UL). Littelfuse components include additional certifications (K-MARK, PSE) and specify operating temperature ranges (-55°C to 125°C), providing extended environmental performance documentation.

Frequently Asked Questions (FAQ)

Q: Can BK/MDA-30-R be used as a direct replacement for BK/MDA-30A-R?

A: Yes. BK/MDA-30-R is a direct electrical and mechanical equivalent. Both components share identical current rating (30 A), voltage ratings (250 V AC, 125 V DC), ceramic cartridge construction, slow-blow response time, and 3AB/3AG form factor. The primary difference is product status: BK/MDA-30A-R is obsolete while BK/MDA-30-R is active.

Q: What is the difference between Eaton and Littelfuse substitutes?

A: All substitutes meet the primary equivalence criteria for current, voltage, response time, and mechanical form factor. Littelfuse components (0326030 series) provide additional environmental specifications, including operating temperature range (-55°C to 125°C) and expanded regulatory certifications. Eaton components maintain direct manufacturer continuity for existing supply chains.

Q: Are Littelfuse 0326030 series fuses compatible with existing 3AB/3AG holders?

A: Yes. All Littelfuse 0326030 series components (0326030.HXP, 0326030.MXP, 0326030.VXP) are manufactured to the 3AB/3AG form factor with identical dimensions (6.35mm diameter x 31.75mm length). They are mechanically and electrically compatible with standard 3AB/3AG fuse holders.

Q: What does "Slow Blow" response time mean?

A: Slow Blow fuses tolerate temporary current surges without opening. They are designed to carry brief overcurrent conditions while protecting against sustained overcurrent or short-circuit faults. All substitute parts maintain this response characteristic.

Q: Which substitute has the highest inventory availability?

A: 0326030.MXP (Littelfuse) has the highest current inventory with 2,347 units in stock, followed by BK/MDA-30-R (Eaton) with 2,475 units in stock.

Q: Are all substitutes ROHS3 compliant?

A: Yes. All substitute parts listed are ROHS3 compliant, meeting environmental and hazardous substance restrictions.

Q: Can I mix Eaton and Littelfuse fuses in the same system?

A: Yes. All substitute parts meet identical electrical specifications and mechanical form factors. Mixed-manufacturer installations are electrically and mechanically compatible within the same fuse holder application.

Request Quote (Ships tomorrow)

Part Number

Quantity

Company

Contact Name

E-mail

Message